abc /-active body control problem on 2001 Mercedes-Benz S55 AMG

my abc light came on..-car is stuck on lowered position and will not move up or down..-i have changed fluid/filter flush..-right front strut stuck on high position..ran code= b411 bad right front sensor..-no leaks..-do i have to change strut or is there something else that might cause it to be like that..??-valve/pump/etc..-??-please let me know..thanks..-